The opposite happens in my garden!
However, my Astilbe's looked pretty dead at the end of last season, after a prolonged dry spell (Yes, a dry spell in IRELAND
)
Hope they come back. I like them a lot.
My soil is quite good - so good that I have a continuous struggle with weeds.
Nettles tend to be a good indicator of good soil (I think I read that somewhere - can anybody comment?) Not too much trouble if they are eradicated early. If not, they van have huge root system,and of course they spread.
Ive got some fine specimens
I imagine weeds would be easier to remove in sandy soil - is that the case?